Backpack



FIG. 1 is a front view showing my new design for a backpack.

FIG. 2 is a back view of the backpack of FIG. 1.

FIG. 3 is a right side view of the backpack of FIG. 1.

FIG. 4 is a left side view of the backpack of FIG. 1.

FIG. 5 is a top view of the backpack of FIG. 1; and,

FIG. 6 is a bottom view of the backpack of FIG. 1.

The broken lines depict portions of the backpack that form no part ofthe claimed design.

CLAIM The ornamental design for a backpack, as shown and described.